+@node Momentary Mark
+@section Using Transient Mark Mode Momentarily
+
+ If you don't like Transient Mark mode in general, you might still
+want to use it once in a while. To do this, type @kbd{C-@key{SPC}
+C-@key{SPC}} or @kbd{C-u C-x C-x}. These commands set or activate the
+mark, and enable Transient Mark mode only until the mark is
+deactivated.
+
+@table @kbd
+@item C-@key{SPC} C-@key{SPC}
+@kindex C-@key{SPC} C-@key{SPC}
+Set the mark at point (like plain @kbd{C-@key{SPC}}), and enable
+Transient Mark mode just once until the mark is deactivated. (This is
+not really a separate command; you are using the @kbd{C-@key{SPC}}
+command twice.)
+
+@item C-u C-x C-x
+@kindex C-u C-x C-x
+Activate the mark without changing it, enable Transient Mark mode just
+once until the mark is deactivated. (This is the @kbd{C-x C-x} command,
+@code{exchange-point-and-mark}, with a prefix argument.)
+@end table
+
+ One of the secondary features of Transient Mark mode is that certain
+commands operate on the region when there is an active region. If you
+don't use Transient Mark mode, the region once set never becomes
+inactive, so there is no way these commands to make such a
+distinction. Enabling Transient Mark mode momentarily gives you a way
+to use these commands on the region.
+
+ The other way momentarily use of Transient Mark mode is useful
+is that it highlights the region for the time being.
+